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The recloser shall
be suitable for outdoor applications. The recloser tank shall be totally
enclosed with corrosion resistant cast aluminum. A pressure equalizing
system to prohibit ingress of moisture into the switch shall be used.
No heaters shall be used within the recloser.
A pressure relief system shall be provided to reduce pressure build
up in the switch in the event of an internal fault.
Air bushings shall be porcelain or EPR polymer with standard NEMA two
hole terminal pads.
Current interruption shall be by vacuum interrupters manufactured in
a highly controlled process using vacuum furnaces.
Solid non-hydroscopic, high dielectric material shall be used to insulate
around the vacuum interrupter. No oil or SF-6 gas shall be used for
interruption or insulation.
The operating mechanism shall utilize solenoids for opening and closing
functions. No electronics shall be used in the recloser mechanism.
The recloser shall contain no high voltage closing coils.
The current transformer shall be mounted externally on the recloser tank and be easily
removable.
The current transformer shall be externally surrounded by a grounded metal surface to limit the possibility of hazardous voltage entering the control compartment, via the current transformer circuits, in the even of an external high voltage flashover.
Switch position indication for each phase shall be located on the bottom
of the recloser to permit viewing from the ground.
The Recloser shall have provisions for surge arrester mounting to allow
for easy connection.
The recloser weight shall not exceed 300lbs in order to reduce the total
installation time and cost.
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